Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard
We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jog.2016.121 https://doaj.org/article/180a7ed8eaa84c11937a1762165d3a4e |
id |
ftdoajarticles:oai:doaj.org/article:180a7ed8eaa84c11937a1762165d3a4e |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:180a7ed8eaa84c11937a1762165d3a4e 2023-05-15T15:33:55+02:00 Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard YONGMEI GONG THOMAS ZWINGER STEPHEN CORNFORD RUPERT GLADSTONE MARTINA SCHÄFER JOHN C. MOORE 2017-02-01T00:00:00Z https://doi.org/10.1017/jog.2016.121 https://doaj.org/article/180a7ed8eaa84c11937a1762165d3a4e EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143016001210/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.121 0022-1430 1727-5652 https://doaj.org/article/180a7ed8eaa84c11937a1762165d3a4e Journal of Glaciology, Vol 63, Pp 106-117 (2017) basal sliding glacial modeling transient simulation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2017 ftdoajarticles https://doi.org/10.1017/jog.2016.121 2023-03-12T01:30:59Z We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-varying surface mass-balance data from the regional climate model HIRHAM5 are downscaled according to elevation. Basal friction coefficient is varied through time by interpolating between two data-constrained inversions of surface velocity fields, from 1995 and 2011. Evolution of the basal boundary condition appears to be much more important for mass discharge and the dynamic response of the fast flowing unit in Basin 3 than either model choice or the downscaling method for the surface mass balance. In addition, temporally linear extrapolation of the evolution of basal friction coefficient beyond the 2011 distribution could not reproduce the expansion of the acceleration observed in southern Basin 3 between January 2012 and June 2013. This implies that changes in basal friction patterns, and in turn basal processes that are not currently represented in either model, are among the most important factors for the 2012 acceleration. Article in Journal/Newspaper Austfonna glacier Ice cap Journal of Glaciology Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Journal of Glaciology 63 237 106 117 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
basal sliding glacial modeling transient simulation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
basal sliding glacial modeling transient simulation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 YONGMEI GONG THOMAS ZWINGER STEPHEN CORNFORD RUPERT GLADSTONE MARTINA SCHÄFER JOHN C. MOORE Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
topic_facet |
basal sliding glacial modeling transient simulation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-varying surface mass-balance data from the regional climate model HIRHAM5 are downscaled according to elevation. Basal friction coefficient is varied through time by interpolating between two data-constrained inversions of surface velocity fields, from 1995 and 2011. Evolution of the basal boundary condition appears to be much more important for mass discharge and the dynamic response of the fast flowing unit in Basin 3 than either model choice or the downscaling method for the surface mass balance. In addition, temporally linear extrapolation of the evolution of basal friction coefficient beyond the 2011 distribution could not reproduce the expansion of the acceleration observed in southern Basin 3 between January 2012 and June 2013. This implies that changes in basal friction patterns, and in turn basal processes that are not currently represented in either model, are among the most important factors for the 2012 acceleration. |
format |
Article in Journal/Newspaper |
author |
YONGMEI GONG THOMAS ZWINGER STEPHEN CORNFORD RUPERT GLADSTONE MARTINA SCHÄFER JOHN C. MOORE |
author_facet |
YONGMEI GONG THOMAS ZWINGER STEPHEN CORNFORD RUPERT GLADSTONE MARTINA SCHÄFER JOHN C. MOORE |
author_sort |
YONGMEI GONG |
title |
Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_short |
Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_full |
Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_fullStr |
Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_full_unstemmed |
Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_sort |
importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on austfonna, svalbard |
publisher |
Cambridge University Press |
publishDate |
2017 |
url |
https://doi.org/10.1017/jog.2016.121 https://doaj.org/article/180a7ed8eaa84c11937a1762165d3a4e |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) |
geographic |
Svalbard Austfonna |
geographic_facet |
Svalbard Austfonna |
genre |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
genre_facet |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
op_source |
Journal of Glaciology, Vol 63, Pp 106-117 (2017) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143016001210/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.121 0022-1430 1727-5652 https://doaj.org/article/180a7ed8eaa84c11937a1762165d3a4e |
op_doi |
https://doi.org/10.1017/jog.2016.121 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
237 |
container_start_page |
106 |
op_container_end_page |
117 |
_version_ |
1766364507997732864 |